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[winner]

For fun I'm trying to make a little (2d side view) tiled physics simulator so I can have fun collapsing mountains.  The problem is I'm having trouble coming up with a simple set of calculations for the physics, so that blocks store up momentum as they fall and arches collapse when their strength is exceeded.  I'm hoping that one of you has a better idea of how this could be done.

[Armok]

Tiles are not really a good way to do rotations and arcs like that...

[Realmfighter]

It all depends on how big the tiles are, really.

[winner]

I know that they are not good for rotation and arcs so I am willing to do without those things.

[Bricks]

I imagine you could work this using classical physics and simulating friction between adjacent tiles.  You wouldn't have a frictional "force," per se, since a tile system doesn't naturally allow for continuous things like forces.  But adjacent tiles should retard movement some, enough to allow for stalactites and small caves.  I don't think there is a simple, cellular-automata-like method unless you want to go for some serious oversimplification.  But I'll keep thinking about it.

[eerr]

What about using hexagonal tiles?

Like nestling egg cartons together. Side by side.

If a boulder falls upon the tip top rock, it falls to one side(perhaps even depending on rock rotation!)
A rock can fall straight down, to the side, or any combination of the two you can program.